Fatal error: Uncaught Error: Class "Shopware\Core\Framework\Migration\MigrationStep" not found in /home/amper418/shopv2.amperio.ch/vendor/shopware/core/Migration/V6_3/Migration1573729158AddSitemapConfig.php:17 Stack trace: #0 {main} thrown in /home/amper418/shopv2.amperio.ch/vendor/shopware/core/Migration/V6_3/Migration1573729158AddSitemapConfig.php on line 17